CN105781554B - A kind of open coal mine draws bucket shovel overcast stripping recovery method - Google Patents
A kind of open coal mine draws bucket shovel overcast stripping recovery method Download PDFInfo
- Publication number
- CN105781554B CN105781554B CN201610220802.2A CN201610220802A CN105781554B CN 105781554 B CN105781554 B CN 105781554B CN 201610220802 A CN201610220802 A CN 201610220802A CN 105781554 B CN105781554 B CN 105781554B
- Authority
- CN
- China
- Prior art keywords
- stripping
- shovel
- truck
- bucket shovel
- ditch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C47/00—Machines for obtaining or the removal of materials in open-pit mines
- E21C47/02—Machines for obtaining or the removal of materials in open-pit mines for coal, brown coal, or the like
Abstract
Embodiments of the invention disclose a kind of open coal mine and draw bucket shovel overcast stripping recovery method, are related to Opencut coal mine mining technical field, can ensure coal seam exposure speed, improve and draw bucket shovel operating efficiency.The open coal mine draws bucket shovel overcast stripping recovery method, including：Entity rock step progress pinpoint blasting to coal seam top forms quick-fried heap；Using bull-dozer, monobucket truck integration of operation up-stripping, quick-fried heap is bulldozed, forms the operation square position of predetermined altitude；Bucket shovel is drawn to stand on progress casting operation on operation square position；Pull shovel handling operation completes the overburden operation in a wing exploiting field to side is held；Wherein, bull-dozer, monobucket truck integration of operation fulfil assignment square position to after holding side position, and monobucket truck direction of propulsion of turning round reversely digs ditch along step bench toe on the inside of operation square position and carries out up-stripping, digs material caused by ditch and is used to expand the operation square position.The present invention is applied to open coal mine and draws bucket shovel overcast stripping exploitation.
Description
Technical field
The present invention relates to Opencut coal mine mining technical field, more particularly to a kind of open coal mine to draw bucket shovel without transport casting work
Skill recovery method.
Background technology
The key operation flow of domestic open coal mine application overcast stripping is as follows：
(1) the advance pinpoint blasting of the high step of entity forms quick-fried heap；
(2) bull-dozer, monobucket-quick-fried heap in truck up-stripping part, and square position is expanded, flattened；
(3) bucket shovel is drawn to stand on progress casting operation on operation square position.
It is existing with the change of coal market environment and the production-scale expansion of open coal mine for above work flow
For overcast stripping to tackle the lifting of coal production capacity, the following two methods of generally use carry out the regulation that relation is adopted in stripping：
(1) the high shoulder height of casting entity is reduced, is improved under top rock monobucket-truck stripping technology workload, reduction
The workload of portion's rock pinpoint blasting-overcast stripping；
(2) operation square position height is reduced, improves bull-dozer, monobucket-truck up-stripping workload, reduces Pull shovel handling
Workload.
Above two adjusting method can be caused without transport casting nucleus equipment --- draws under bucket shovel unit operation efficiency
Drop, under the conditions of the raising of raw coal production capacity, material peel off burden increase, cause to peel off cost raising.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of open coal mine and draws bucket shovel overcast stripping recovery method, energy
Enough ensure coal seam exposure speed, improve and draw bucket shovel operating efficiency.
To reach above-mentioned purpose, embodiments of the invention adopt the following technical scheme that：
A kind of open coal mine draws bucket shovel overcast stripping recovery method, including：
Step 1, the entity rock step to coal seam top carry out pinpoint blasting and form quick-fried heap；
Step 2, using bull-dozer, monobucket-truck integration of operation up-stripping, be bulldozed quick-fried heap, form the work of predetermined altitude
Industry square position；
Step 3, bucket shovel is drawn to stand on progress casting operation on operation square position；
Step 4, Pull shovel handling operation complete the overburden operation in a wing exploiting field to side is held；
Wherein, after operation to the end side position described in step 2 is completed in bull-dozer, monobucket-truck integration of operation, monobucket-card
Car direction of propulsion of turning round reversely digs ditch along step bench toe on the inside of the operation square position and carries out up-stripping, digs material caused by ditch and uses
In the expansion operation square position.
Alternatively, the height of the operation square position is 13-14m.
Alternatively, monobucket-truck turn round direction of propulsion on the inside of the operation square position along step bench toe reversely dig ditch carry out it is auxiliary
When helping stripping, dig ditch width and pick ditch final position and adopt relation according to stripping on the premise of not influenceing to draw bucket shovel operation standing area
Depending on coordination.
Alternatively, after monobucket-truck completes the pick ditch operation, when going out ditch the truck ramp for helping position will be held to be bulldozed,
And to draw bucket shovel structure end to help out ditch job platform.
Alternatively, when before the Pull shovel handling operation is advanced at the pick ditch of monobucket-truck, with the first fltting speed
Carry out casting operation；
When the Pull shovel handling operation is advanced at the pick ditch of monobucket-truck, casting work is carried out with the second fltting speed
Industry；Wherein, the second fltting speed is more than the first fltting speed.
A kind of open coal mine provided in an embodiment of the present invention draws bucket shovel overcast stripping recovery method, bull-dozer, list
Bucket-truck integration of operation up-stripping, quick-fried heap is bulldozed, forms the operation square position of predetermined altitude to after holding side position, monobucket-truck
Direction of propulsion of turning round reversely digs ditch along step bench toe on the inside of operation square position and carries out up-stripping, and material caused by pick ditch is used for
The operation square position is expanded, can so realize up-stripping equipment and crucial casting equipment availability inventory in casting system
Equilibrium is coordinated, and can either ensure coal seam exposure speed during relation regulation is adopted in stripping, improves and draw bucket shovel operating efficiency, ensure
Bucket shovel is drawn to maintain maximum unit operation ability.In addition, also to draw bucket shovel energy in the case where production capacity improves, peels off burden
Enough technology, economic advantages for continuing to play overcast stripping.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a wing high step schematic cross-section to be blasted in the embodiment of the present invention；
Fig. 2 is a wing high step sling blasting schematic cross-section in the embodiment of the present invention；
Fig. 3 is that monobucket-truck is bulldozed the quick-fried heap schematic cross-section of a wing in the embodiment of the present invention；
Fig. 4 is open coal mine in the embodiment of the present invention without transport casting working face mining schematic diagram；
Fig. 5 is that monobucket in the embodiment of the present invention-truck auxiliary is bulldozed collapsing figure；
Fig. 6 is that monobucket-truck digs ditch schematic diagram in the embodiment of the present invention；
Fig. 7 is that pick ditch finishes design sketch in the embodiment of the present invention.
In figure：1st, high step to be blasted, 2, coal seam, 3, fall mound, 4, the quick-fried heap of throwing, 5, monobucket-truck auxiliary be bulldozed it is quick-fried
Heap, 6, operation square position, 7, the quick-fried heap direction of propulsion of monobucket-truck up-stripping, 8, Pull shovel handling operation direction of propulsion, 9, coal seam
Direction of extraction, 10, end side, 11, truck ramp, 12, monobucket-truck pick ditch direction of propulsion, 13, monobucket-truck pick ditch position,
14th, dig ditch expand square position, 15, draw bucket shovel end help out ditch job platform.
Embodiment
Bucket shovel overcast stripping recovery method is drawn a kind of open coal mine of the embodiment of the present invention to enter below in conjunction with the accompanying drawings
Row is described in detail.
It will be appreciated that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
Its embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 1 to Fig. 7, a kind of open coal mine of the present invention draws bucket shovel overcast stripping recovery method embodiment, bag
Include：
Step 1, the entity rock step to coal seam top carry out pinpoint blasting and form quick-fried heap.
In this step, blasthole is drilled with the high step of entity on coal seam top using perforation rig in advance, then installing is fried
Medicine carries out pinpoint blasting.The throwing rate of pinpoint blasting can reach 33%, by the direct throwing of about 1/3 overburden amount to goaf
It is interior.
Step 2, using bull-dozer, monobucket-truck integration of operation up-stripping, be bulldozed quick-fried heap, form the work of predetermined altitude
Industry square position.
In the present embodiment, monobucket-truck systems are mainly made up of power shovel (being commonly called as power shovel) and haulage truck.
In the present embodiment, after pinpoint blasting implementation, carry out dropping section operation on quick-fried heap dedicated for dropping the bull-dozer of section,
This work mainly has two effects, is brushing power shovel preparation place first, reducing the height of the quick-fried heap of pinpoint blasting step,
A part of overburden amount is directly pushed away and abandoned to goaf, second, shoveling preparation work square position while section is dropped to draw to struggle against.
Bull-dozer will carry out at the top of quick-fried heap smooth, prepare after the working berm of dredger dredge, adjust dredger dredge to be brushed
Help operation, by formed after presplit blasting it is domatic on remaining quick-fried amount casting to outside, high bench face is brushed out into pre- ceasma.Push away
Native machine is tracked operation at power shovel rear, and the quick-fried amount that power shovel is poured out pushes away to refuse dump side abandons, and quick-fried heap is carried out into part drop
Section, and to draw bucket shovel to do expansion platform.
After the completion of power shovel is made to pre- broken face upper brushes helper, work-yard is carried out through bull-dozer it is smooth, when meeting truck
During traffic condition, by power shovel be adjusted to draw bucket shovel will operation one end, carried out by the way of the working face of end drop section operation, its shell
Dumped from amount by truck to shovel standing place of struggling against is drawn close to the side of refuse dump, to draw bucket shovel to do expansion platform.
When drawing the shovel expansion platform width that struggles against to meet its operating condition, truck cooperation power shovel is to draw bucket shovel to do with remaining quick-fried amount
Into the contact road of working face or end side contact road, route possess truck pass through condition after, by the remaining quick-fried amount of power shovel operation by
Truck is directly dumped to internal dumping.So, the workload for drawing bucket shovel is both reduced, that has saved drawing bucket shovel again dumps space.
Excavated by dredger dredge and bull-dozer pushes away and abandons operation, the final work to draw bucket shovel to prepare wide 120m or so is put down
Disk, the quick-fried heap shoulder height for drawing bucket shovel operation are 13-15m or so.Bucket shovel is now drawn to enter operation horizontal by centre contact road
Disk carries out casting operation.
In the present embodiment, the highly preferred of the operation square position is 13-14m.Bucket is drawn when operation square position is highly 13-14m
Shovel unit casting operating efficiency highest.
Step 3, bucket shovel is drawn to stand on progress casting operation on operation square position.
Bucket shovel is drawn, is a kind of large-scale walking excavator, for coal, shale, ferrous metal and nonferrous metallic ores etc.
Strip mining transformation and extensive hydraulic engineering are cut the earth.It is mainly used for when peeling off casting to goaf, open pit quarry, water
Sharp engineering edge.It can be by the casting of bulk to larger distance.
In this step, draw bucket shovel to stand on working berm, directly dumped to goaf after excavating material.
Step 4, Pull shovel handling operation complete the overburden operation in a wing exploiting field to side is held.
In the embodiment of the present invention, position is helped at operation to the end that bull-dozer, monobucket-truck integration of operation complete described in step 2
Afterwards, monobucket-truck direction of propulsion of turning round reversely digs ditch along step bench toe on the inside of the operation square position and carries out up-stripping, pick ditch production
Raw material is used to expand the operation square position.
In the equipment that overcasting technigue recovery method of the embodiment of the present invention is used, bull-dozer, monobucket-truck set for up-stripping
Standby, it is crucial casting equipment to draw bucket shovel.
A kind of open coal mine provided in an embodiment of the present invention draws bucket shovel overcast stripping recovery method, bull-dozer, list
Bucket-truck integration of operation up-stripping, quick-fried heap is bulldozed, forms the operation square position of predetermined altitude to after holding side position, monobucket-truck
Direction of propulsion of turning round reversely digs ditch along step bench toe on the inside of operation square position and carries out up-stripping, and material caused by pick ditch is used for
The operation square position is expanded, can so realize up-stripping equipment and crucial casting equipment availability inventory in casting system
Equilibrium is coordinated, and can either ensure coal seam exposure speed during relation regulation is adopted in stripping, improves and draw bucket shovel operating efficiency, ensure
Bucket shovel is drawn to maintain maximum unit operation ability.In addition, also to draw bucket shovel energy in the case where production capacity improves, peels off burden
Enough technology, economic advantages for continuing to play overcast stripping.
In foregoing open coal mine draws bucket shovel overcast stripping recovery method embodiment, alternatively, monobucket-truck falls
Turn direction of propulsion when ditch progress up-stripping is reversely dug in operation square position inner side along step bench toe, dig ditch width and pick ditch terminates
Position according to stripping depending on harmonious relations are adopted on the premise of not influenceing to draw bucket shovel operation standing area.So can be more efficiently
Up-stripping equipment coordination balanced with crucial casting equipment availability inventory in casting system is realized, ensures coal seam exposure speed
Degree, improve and draw bucket shovel operating efficiency.
In foregoing open coal mine draws bucket shovel overcast stripping recovery method embodiment, alternatively, monobucket-truck is complete
Into after the pick ditch operation, when going out ditch the truck ramp for helping position will be held to be bulldozed, and to draw bucket shovel structure end to help out ditch operation
Platform, so, both avoid drawing bucket shovel and holding side position to carry out casting operation, improve casting efficiency, helped again for drawing bucket shovel at end
Position, which smoothly goes out ditch and provided, is easy to condition.
It is alternatively, described to draw bucket shovel in foregoing open coal mine draws bucket shovel overcast stripping recovery method embodiment
Casting operation be advanced at the pick ditch of monobucket-truck before when, with the first fltting speed carry out casting operation；The drawing bucket is slide tackled
When heap operation is advanced at the pick ditch of monobucket-truck, casting operation is carried out with the second fltting speed；Wherein, the second fltting speed
More than the first fltting speed.
In the present embodiment, when Pull shovel handling operation is advanced at monobucket-truck auxiliary pick ditch, due to monobucket-truck
The casting operation of pick ditch inventory is completed, therefore draws backcast stripping amount in bucket shovel unit advance distance to reduce, Pull shovel handling pushes away
Enter speed quickening.The recovery method of the embodiment of the present invention also referred to as draws bucket shovel speed change to promote overcast stripping exploitation side
Method, bucket shovel constant speed is drawn to promote overcast stripping recovery method relative to existing, the embodiment of the present invention can realize casting
Up-stripping equipment is balanced with crucial casting equipment availability inventory in system coordinates, and can either adopt relation regulation process in stripping
In, ensure coal seam exposure speed, improve and draw bucket shovel operating efficiency, ensure to draw bucket shovel to maintain maximum unit operation ability.In addition,
So that bucket shovel is drawn to can continue to play the technology of overcast stripping, warp in the case where production capacity improves, peels off burden
Ji advantage.
Particularly under the constantly high situation of current oil price, mine truck tire price, casting entity is neither being reduced
High shoulder height, in the case of also not reducing operation square position height, the embodiment of the present invention is to up-stripping equipment in casting system
Balanced with crucial casting equipment availability inventory to coordinate, odds for effectiveness and cost advantage are more obvious.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can readily occur in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (5)
1. a kind of open coal mine draws bucket shovel overcast stripping recovery method, it is characterised in that including：
Step 1, the entity rock step to coal seam top carry out pinpoint blasting and form quick-fried heap；
Step 2, using bull-dozer, monobucket-truck integration of operation up-stripping, be bulldozed quick-fried heap, form the operation horizontal of predetermined altitude
Disk；
Step 3, bucket shovel is drawn to stand on progress casting operation on operation square position；
Step 4, Pull shovel handling operation complete the overburden operation in a wing exploiting field to side is held；
Wherein, after operation to the end side position described in step 2 is completed in bull-dozer, monobucket-truck integration of operation, monobucket-truck falls
Turn direction of propulsion and reversely dig ditch progress up-stripping along step bench toe on the inside of operation square position, dig material caused by ditch and be used to open up
Operation square position described in exhibition.
2. open coal mine according to claim 1 draws bucket shovel overcast stripping recovery method, it is characterised in that described
The height of operation square position is 13-14m.
3. open coal mine according to claim 1 or 2 draws bucket shovel overcast stripping recovery method, it is characterised in that
Monobucket-truck turns round direction of propulsion when ditch progress up-stripping is reversely dug in operation square position inner side along step bench toe, digs furrow width
Degree and pick ditch final position according to stripping depending on harmonious relations are adopted on the premise of not influenceing to draw bucket shovel operation standing area.
4. open coal mine according to claim 1 or 2 draws bucket shovel overcast stripping recovery method, it is characterised in that
After monobucket-truck completes the pick ditch operation, when going out ditch the truck ramp for helping position will be held to be bulldozed, and to draw bucket shovel structure end
Help out ditch job platform.
5. open coal mine according to claim 1 or 2 draws bucket shovel overcast stripping recovery method, it is characterised in that
The Pull shovel handling operation be advanced at the pick ditch of monobucket-truck before when, with the first fltting speed carry out casting work
Industry；
When the Pull shovel handling operation is advanced at the pick ditch of monobucket-truck, casting operation is carried out with the second fltting speed；Its
In, the second fltting speed is more than the first fltting speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610220802.2A CN105781554B (en) | 2016-04-11 | 2016-04-11 | A kind of open coal mine draws bucket shovel overcast stripping recovery method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610220802.2A CN105781554B (en) | 2016-04-11 | 2016-04-11 | A kind of open coal mine draws bucket shovel overcast stripping recovery method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105781554A CN105781554A (en) | 2016-07-20 |
| CN105781554B true CN105781554B (en) | 2018-01-12 |
Family
ID=56396098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610220802.2A Expired - Fee Related CN105781554B (en) | 2016-04-11 | 2016-04-11 | A kind of open coal mine draws bucket shovel overcast stripping recovery method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105781554B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106368706A (en) * | 2016-08-27 | 2017-02-01 | 肖双双 | Casting blast and pull shovel handling mining procedure |
| US9783955B1 (en) | 2016-11-09 | 2017-10-10 | Caterpillar Inc. | System and method for moving material |
| US10640952B2 (en) | 2016-12-09 | 2020-05-05 | Caterpillar Inc. | System and method for modifying a material movement plan |
| CN106761759B (en) * | 2016-12-28 | 2019-03-22 | 中国神华能源股份有限公司 | A kind of coal-mining method of open coal mine |
| CN106930765B (en) * | 2017-03-16 | 2019-01-11 | 福建省新华都工程有限责任公司 | The Ratio in Open-pit Mine dress method of dress process realization cost efficiency is inherently adopted in a kind of change |
| CN107687342B (en) * | 2017-08-21 | 2019-05-21 | 中国矿业大学 | A kind of open coal mine drawing bucket shovel active line segmentation alternative expression exploiting field forward method |
| CN109931064B (en) * | 2019-03-14 | 2020-11-24 | 华北科技学院 | Independent reverse stacking operation method for dragline of opencast coal mine |
| CN109899072B (en) * | 2019-03-22 | 2020-08-18 | 华北科技学院 | Circulating walking operation method for working face of dragline of opencast coal mine |
| CN109944592B (en) * | 2019-03-28 | 2020-10-16 | 辽宁工程技术大学 | Method for designing height of throwing blasting step in dragline dump process |
| CN109931065B (en) * | 2019-04-03 | 2020-09-25 | 华北科技学院 | Open pit coal mine throwing blasting-loosening blasting partition mining method |
| CN110700837A (en) * | 2019-11-29 | 2020-01-17 | 神华准格尔能源有限责任公司 | Dragline operation method |
| CN113047840B (en) * | 2021-04-27 | 2023-06-27 | 车兆学 | Stripping semi-continuous reverse pile process for open coal mine |
| CN115977642B (en) * | 2022-10-28 | 2023-08-29 | 国能经济技术研究院有限责任公司 | Double working surface back and forth moving and pile-reversing operation method of bucket-pulling shovel |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE372450C (en) * | 1921-09-07 | 1923-03-29 | Clemens Abels | Open pit mine with pivoting operation and tilting platform |
| CN103174427B (en) * | 2013-04-09 | 2015-04-29 | 中煤平朔集团有限公司 | Method for exploiting downward deepening section of anticlinal part of opencast coal mine |
| CN103388478B (en) * | 2013-07-30 | 2015-07-15 | 中国神华能源股份有限公司 | Forming method for transportation road of bucket shovel applied to open pit coal mine |
| CN103470262A (en) * | 2013-09-12 | 2013-12-25 | 中国矿业大学 | Mining method of nearly horizontal mineral deposit of opencast coal field by casting and internally dumping |
| CN104405397A (en) * | 2014-10-10 | 2015-03-11 | 赵红泽 | Open-pit coal mine double-pit dynamic stripping ratio adjusting method |
-
2016
- 2016-04-11 CN CN201610220802.2A patent/CN105781554B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN105781554A (en) | 2016-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105781554B (en) | A kind of open coal mine draws bucket shovel overcast stripping recovery method | |
| CN103216238B (en) | A kind of Opencut coal mine mining technique | |
| CN103216237B (en) | A kind of Opencut coal mine mining technique | |
| CN107013217B (en) | A kind of open coal mine casting bridge-type Pull shovel handling operational method | |
| AU2013358812B2 (en) | Solid-filling coal mining method with two pre-excavated tunnels for advancing | |
| CN100535387C (en) | Improved sublevel caving method without bottom column | |
| WO2016045440A1 (en) | Mining method | |
| CN106869936A (en) | It is a kind of to be suitable to the surface mining new method of steep slope topography | |
| CN107687342B (en) | A kind of open coal mine drawing bucket shovel active line segmentation alternative expression exploiting field forward method | |
| CN103470262A (en) | Mining method of nearly horizontal mineral deposit of opencast coal field by casting and internally dumping | |
| WO2020010696A1 (en) | Method for recovering room coal pillars through reserved roadway cemented filling | |
| CN103388478B (en) | Forming method for transportation road of bucket shovel applied to open pit coal mine | |
| CN109931064B (en) | Independent reverse stacking operation method for dragline of opencast coal mine | |
| CN103470263A (en) | New-level development method for open-pit metal mine | |
| CN104358574A (en) | Horizontal room-and-pillar mining method of slightly inclined orebody | |
| CN102235010B (en) | Treatment method for hanging sinking stop due to expansive soil in well sinking | |
| CN105626068B (en) | Help the method for dismounting of bridge in open coal mine end | |
| CN105626076B (en) | It is a kind of to draw bucket shovel zigzag working berm high-efficiency mining method | |
| CN110080774A (en) | Mine Dry-placed fill mining is fallen based on the vertical medium-length hole retrusive of high-dipping ore block | |
| CN109630116B (en) | Mining method for inclined medium-thickness blind ore body | |
| CN110397439A (en) | Mine Dry-placed fill mining is fallen based on the vertical medium-length hole retrusive of high-dipping ore block | |
| CN108252718A (en) | Suitable for the surface mining method of slight slope and thin ore body | |
| CN207177895U (en) | A kind of noble metal inclined orebody ro om -character | |
| Yamatomi et al. | Surface mining methods and equipment | |
| CN103993884A (en) | One-time well forming and maintenance method through cutting instead of tunneling during cutting air return well in medium-length hole mining |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180112 Termination date: 20190411 |